Switch parallel dynamic current sharing circuit based on negative coupling mutual inductors

Abstract

The invention provides a switch parallel connection dynamic current sharing circuit based on negative coupling mutual inductors. the circuit comprises n branches connected in parallel and (n-1) negative coupling mutual inductors, and n is greater than or equal to 2; And the (n-1) negative coupling mutual inductors are connected to the n branches connected in parallel, one negative coupling mutual inductor is connected in series between every two adjacent branches, and one direct current switch is connected in series to each branch. According to the switch parallel dynamic current sharing circuit based on the negative coupling mutual inductors provided by the invention, the safety of the direct-current switch in parallel branches is improved.

Description

technical field [0001] The invention belongs to the technical field of switch protection, in particular to a switch parallel dynamic current sharing circuit based on a negative coupling transformer. Background technique [0002] The DC switch is an indispensable key equipment in the DC power grid, which can cut off the fault current caused by the short circuit in a very short time to ensure the safe and reliable operation of the DC system. Due to the small damping of the DC power grid, the rate of rise of the fault current caused by the short circuit is very high, so that the current amplitude of the DC switch that needs to be broken is very large. A single DC switch usually cannot withstand such a high current, so a parallel connection is usually required. [0003] However, due to the fact that the stray inductance in the DC switch is often different, and there is also a slight gap in the turn-on and turn-off time of the DC switch, the current of the parallel-connected DC ...

AI Technical Summary

Problems solved by technology

A single DC switch usually cannot withstand such a high current, therefore, it is usually necessary to use a parallel connection

[0003] However, due to the fact that the stray inductance in the DC switch is often different, and there is also a slight gap in the turn-on and turn-off time of the DC switch, the current of the parallel-connected DC switch will have a large difference when it operates, and this difference may even cause overshooting. The risk of current failure, therefore, how to ensure the current balance of each DC switch during switching dynamics is the key to the parallel application of DC switches

Images